What type of radar is often used in active Missile Approach Warning Systems (MAWS)?

Active Missile Approach Warning Systems (MAWS) utilize radar technology to detect incoming missiles. The Pulse Doppler radar is particularly effective in this role due to its ability to measure the velocity of targets at extended ranges while distinguishing between moving and stationary objects. This capability is crucial for identifying threats accurately in a high-speed environment.

Pulse Doppler radars operate by emitting a series of pulses and analyzing the frequency shift of the returning signals, which is influenced by the Doppler effect. This enables the system to detect not just the presence of an incoming missile, but also to gauge its speed and trajectory, allowing for timely warnings and countermeasures.

In contrast, the other radar types listed do not provide the same level of effectiveness in tracking fast-moving aerial threats. Infrared systems detect heat signatures rather than using a radar wave, laser systems are more suited for precision targeting than broad detection, and ultraviolet sensors are typically used for specific types of environmental detection rather than missile tracking. Thus, the use of Pulse Doppler technology in MAWS emerges as the most appropriate choice for active missile detection.